We look at the division of 31155399 by 815 
We want to figure out the number of times 31155399 can be divided by 815.

On to step 1:
3 divided by 815 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 815

Going ahead to step 2:
31 divided by 815 is 0 with a remainder of 31.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 31 and we're left with 31.
Bring next digit (1) of the dividend behind the 31 and repeat the process: 311 / 815

Going ahead to step 3:
If we divide 311 by 815, we get 0 and a remainder of 311.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 311 and we're left with 311.
Append the next digit (5) from the dividend to 311 and continue with: 3115 / 815

On to step 4:
3115 divided by 815 is 3 with a remainder of 670.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 2445 from 3115, we get 670.
Fetch the next digit (5) from the dividend, attach it to 670 and continue: 6705 / 815

Step 5:
815 goes into 6705 8 times with a remainder of 185.
Put 8 as the next digit of the answer. 
Result so far: 38.0
Subtracting 6520 from 6705 leaves us with 185.
Take the next digit (3) from the dividend and append it to 185, then repeat: 1853 / 815

Going ahead to step 6:
When dividing 1853 by 815, we get 2 with a remainder of 223.
Put 2 as the next digit of the answer. 
Result so far: 382.0
Deduct 1630 from 1853 and we're left with 223.
Fetch the next digit (9) from the dividend, attach it to 223 and continue: 2239 / 815

Going ahead to step 7:
2239 divided by 815 is 2 with a remainder of 609.
The next digit of our result is 2. 
Result so far: 3822.0
Subtract 1630 from 2239 to get 609.
Take the next digit (9) from the dividend and append it to 609, then repeat: 6099 / 815

Advancing to step 8:
When dividing 6099 by 815, we get 7 with a remainder of 394.
Write down 7 as next digit of the result. 
Result so far: 38227.0
If we take 5705 away from 6099, we end up with 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

Advancing to step 9:
The number 815 fits into 3940 4 times, leaving a remainder of 680.
Put 4 as the next digit of the answer. 
Result so far: 38227.4
If we subtract 3260 from 3940, we get 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

On to step 10:
If we divide 6800 by 815, we get 8 and a remainder of 280.
Record the quotient 8 as the next digit in the result. 
Result so far: 38227.48
Deduct 6520 from 6800 and we're left with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Let's proceed to step 11:
When dividing 2800 by 815, we get 3 with a remainder of 355.
Use 3 as the next digit of our solution. 
Result so far: 38227.483
Subtracting 2445 from 2800 leaves us with 355.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3550, and continue the process.

On to step 12:
If we divide 3550 by 815, we get 4 and a remainder of 290.
The next digit of our result is 4. 
Result so far: 38227.4834
Deduct 3260 from 3550 and we're left with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Going ahead to step 13:
The number 815 fits into 2900 3 times, leaving a remainder of 455.
Put 3 as the next digit of the answer. 
Result so far: 38227.48343
Deduct 2445 from 2900 and we're left with 455.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4550, and continue the process.

Let's proceed to step 14:
815 goes into 4550 5 times with a remainder of 475.
The number 5 becomes the next digit in our result. 
Result so far: 38227.483435
Subtract 4075 from 4550 to get 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

Going ahead to step 15:
815 goes into 4750 5 times with a remainder of 675.
Use 5 as the next digit of our solution. 
Result so far: 38227.4834355
Subtracting 4075 from 4750 leaves us with 675.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6750, and continue the process.

Our division results in 38227.4834355 with a remaining 6.75e-06.